Action Of Electron Beam Research Articles

The interaction of electron beams with water admitted at aluminium single crystal (100) studied by ESD and AES

Processes of adsorption and of electron beam induced desorption of water at aluminium single crystal (100) have been investigated simultaneously using the techniques of Electron Stimulated Desorption (ESD) and of Auger Electron Spectroscopy (AES). The predominant ion production with ESD is H + and OH + ions with, respectively, kinetic energies of around 4.9 and 1.8 eV, and with desorption efficiencies (maxima) of 1×10 −5 and 2×10 −7 ion/electron. The behavior of these ion signals in the initial region of gas exposure (<10 L) at the clean surface is complex - the yield of OH + ions, for example, passes through a maximum at an exposure of around 4 L. Both ions are identified as arising from OH groups at the surface, and the findings, corroborated by the observations with AES, are identified with the transformation of an initial chemisorbed phase to an oxide surface. The kinetics of adsorption, both in the initial chemisorbed phase and with the evolution of oxide, are shown to support an island growth model. The desorption induced by electron impact has similarly been monitored by the two techniques. The technique of ESD is far more responsive to the action of electron beams, and this is attributed to its greater sensitivity to the topmost surface layers. Both techniques contribute to the finding of a process of oxidation induced by electron bombardment.

Decay of a plasma produced by a pulsed beam of accelerated electrons in an He-Ne mixture at high pressure

Increased interest has recently been shown in the low-temperature plasma produced by the action of electron beams on dense gases. This interest is due to the possibility of investigating plasma-chemical reactions in highly nonequilibrium conditions [1] and also to the prospect of introducing new methods of pumping gas lasers: by recombination [12], charge transfer [3], the formation of complex compounds [4, 5], etc. The plasma in question is characterized by high rates of reactions involving charged and neutral particles, which largely accounts for the difficulty of investigating such a plasma experimentally. For instance, problems of determining the kind of ions predominating in the plasma, the mechanism of recombination decay, the nature of the luminescence on individual spectral transitions, etc., become nontrivial. In this paper we investigate the decay of a plasma in neon and in an He-Ne mixture at high gas pressure.

The action of electron beams on polymers and its application: J Sobanski,Pr Nauk Inst Technol Elektron Polytech Wrocl, No 10, 1973, 119–131 ( in Polish)

The action of electron beams on polymers and its application: J Sobanski,Pr Nauk Inst Technol Elektron Polytech Wrocl, No 10, 1973, 119–131 ( in Polish)

Application of the Monte Carlo method for calculating the shape of the heat source generated by the action of electron beams on a substance

The space distribution of energy absorbed in a substance during the passage of an electron beam has been determined with the aid of the Monte Carlo method.